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HOMESERVICE MANUALSCHEVROLET2006SUBURBAN C2500, 6.0 UREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 35 (ENGINE CONTROL SYSTEM - SYSTEM & COMPONENT TESTING)IGNITION SYSTEMSELECTRONIC IGNITION SYSTEM DIAGNOSISDIAGNOSTIC PROCEDURES
2006 Chevrolet Suburban C2500, 6.0 U

Diagnostic Procedures

2006 Chevrolet Suburban C2500, 6.0 USECTION Diagnostic Procedures
WARNING: This page is about a different car, the 2003 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.
  1. Did you perform the Diagnostic System Check - Engine Controls? If yes, go to next step. If no, perform diagnostic system check - engine controls. See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - 1.8L VIBE article.
  2. Using a scan tool, check for DTCs. Is DTC P0335 or P0340 set? If yes, go to DTC P0335: CKP SENSOR CIRCUIT or DTC P0340: CMP SENSOR CIRCUIT under DIAGNOSTIC TESTS in SELF-DIAGNOSTICS - 1.8L VIBE article. If no, go to next step.
  3. Are DTCs P1300, P1305, P1310, or P1315 set? If yes, go to DTC P1300, P1305, P1310, P1315: IGNITION COIL under DIAGNOSTIC TESTS in SELF-DIAGNOSTICS - 1.8L VIBE article. If no, go to next step.
  4. Disconnect the harness connector of each fuel injector. Disconnect the harness connector at an ignition coil assembly. Remove the ignition coil assembly. Do not remove the spark plugs. Connect Spark Tester (J 26792), or equivalent, to the spark plug boot of the ignition coil assembly. Clip the spark tester to ground. Connect the coil assembly harness connector. Crank the engine and observe the spark tester. Repeat this test for each ignition coil assembly. Is a crisp Blue spark available at all ignition coil assemblies? If yes, go to step  7 . If no, go to next step.
  5. Is a crisp Blue spark available at one or more ignition coil assemblies? If yes, go to next step. If no, go to step  9 .
  6. Turn ignition switch to OFF position. Replace suspected faulty ignition coil with a known-good ignition coil. Repeat the test for spark using the Spark Tester. See step  4 . Was a crisp Blue spark present while cranking the engine? If yes, go to step  8 . If no, go to step  9 .
  7. Inspect the ignition coil assembly boot and terminals for cracks, corrosion and carbon tracking Did you find any of the conditions? If yes, go to next step. If no, go to step  10 .
  8. Replace the faulty ignition coil assembly or assemblies. After repair, go to step  10 .
  9. Replace the PCM. After repair, go to step  10 .
  10. Assemble the ignition system. Start the engine. Does the engine start and run? If yes, go to next step. If no, go to ENGINE CRANKS BUT DOES NOT RUN under NO-START DIAGNOSIS in BASIC DIAGNOSTIC PROCEDURES - 1.8L VIBE article.
  11. Check for DTCs. Are any DTCs set? If yes, go to DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS - 1.8L VIBE article.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.